Go sit in it with that Helmet on and then go drive it. Not much room and any taller than you and you are completely screwed.

My local dealer has brought in a demo car with automatic gearbox. I'll wait until they get one with manual gearbox before taking it for a test drive (I'm sure they will be worried if I show up with my helmet). But several people taller than me claimed there was enough space inside, and they struggle in many other cars.

I guess body proportions and seating position can cause a lot of variation here.

But I hope BMW can make a competitior for the GT86, so I don't have to consider the Toyota....